1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2004 IBM Corporation 4 * Copyright (C) 2015 Intel Corporation 5 * 6 * Authors: 7 * Leendert van Doorn <leendert@watson.ibm.com> 8 * Dave Safford <safford@watson.ibm.com> 9 * Reiner Sailer <sailer@watson.ibm.com> 10 * Kylene Hall <kjhall@us.ibm.com> 11 * 12 * Maintained by: <tpmdd-devel@lists.sourceforge.net> 13 * 14 * Device driver for TCG/TCPA TPM (trusted platform module). 15 * Specifications at www.trustedcomputinggroup.org 16 */ 17 18 #ifndef __TPM_H__ 19 #define __TPM_H__ 20 21 #include <linux/module.h> 22 #include <linux/delay.h> 23 #include <linux/mutex.h> 24 #include <linux/sched.h> 25 #include <linux/platform_device.h> 26 #include <linux/io.h> 27 #include <linux/tpm.h> 28 #include <linux/tpm_eventlog.h> 29 30 #ifdef CONFIG_X86 31 #include <asm/intel-family.h> 32 #endif 33 34 #define TPM_MINOR 224 /* officially assigned */ 35 #define TPM_BUFSIZE 4096 36 #define TPM_NUM_DEVICES 65536 37 #define TPM_RETRY 50 38 39 enum tpm_timeout { 40 TPM_TIMEOUT = 5, /* msecs */ 41 TPM_TIMEOUT_RETRY = 100, /* msecs */ 42 TPM_TIMEOUT_RANGE_US = 300, /* usecs */ 43 TPM_TIMEOUT_POLL = 1, /* msecs */ 44 TPM_TIMEOUT_USECS_MIN = 100, /* usecs */ 45 TPM_TIMEOUT_USECS_MAX = 500 /* usecs */ 46 }; 47 48 /* TPM addresses */ 49 enum tpm_addr { 50 TPM_SUPERIO_ADDR = 0x2E, 51 TPM_ADDR = 0x4E, 52 }; 53 54 #define TPM_WARN_RETRY 0x800 55 #define TPM_WARN_DOING_SELFTEST 0x802 56 #define TPM_ERR_DEACTIVATED 0x6 57 #define TPM_ERR_DISABLED 0x7 58 #define TPM_ERR_INVALID_POSTINIT 38 59 60 #define TPM_TAG_RQU_COMMAND 193 61 62 /* TPM2 specific constants. */ 63 #define TPM2_SPACE_BUFFER_SIZE 16384 /* 16 kB */ 64 65 struct stclear_flags_t { 66 __be16 tag; 67 u8 deactivated; 68 u8 disableForceClear; 69 u8 physicalPresence; 70 u8 physicalPresenceLock; 71 u8 bGlobalLock; 72 } __packed; 73 74 struct tpm1_version { 75 u8 major; 76 u8 minor; 77 u8 rev_major; 78 u8 rev_minor; 79 } __packed; 80 81 struct tpm1_version2 { 82 __be16 tag; 83 struct tpm1_version version; 84 } __packed; 85 86 struct timeout_t { 87 __be32 a; 88 __be32 b; 89 __be32 c; 90 __be32 d; 91 } __packed; 92 93 struct duration_t { 94 __be32 tpm_short; 95 __be32 tpm_medium; 96 __be32 tpm_long; 97 } __packed; 98 99 struct permanent_flags_t { 100 __be16 tag; 101 u8 disable; 102 u8 ownership; 103 u8 deactivated; 104 u8 readPubek; 105 u8 disableOwnerClear; 106 u8 allowMaintenance; 107 u8 physicalPresenceLifetimeLock; 108 u8 physicalPresenceHWEnable; 109 u8 physicalPresenceCMDEnable; 110 u8 CEKPUsed; 111 u8 TPMpost; 112 u8 TPMpostLock; 113 u8 FIPS; 114 u8 operator; 115 u8 enableRevokeEK; 116 u8 nvLocked; 117 u8 readSRKPub; 118 u8 tpmEstablished; 119 u8 maintenanceDone; 120 u8 disableFullDALogicInfo; 121 } __packed; 122 123 typedef union { 124 struct permanent_flags_t perm_flags; 125 struct stclear_flags_t stclear_flags; 126 __u8 owned; 127 __be32 num_pcrs; 128 struct tpm1_version version1; 129 struct tpm1_version2 version2; 130 __be32 manufacturer_id; 131 struct timeout_t timeout; 132 struct duration_t duration; 133 } cap_t; 134 135 enum tpm_capabilities { 136 TPM_CAP_FLAG = 4, 137 TPM_CAP_PROP = 5, 138 TPM_CAP_VERSION_1_1 = 0x06, 139 TPM_CAP_VERSION_1_2 = 0x1A, 140 }; 141 142 enum tpm_sub_capabilities { 143 TPM_CAP_PROP_PCR = 0x101, 144 TPM_CAP_PROP_MANUFACTURER = 0x103, 145 TPM_CAP_FLAG_PERM = 0x108, 146 TPM_CAP_FLAG_VOL = 0x109, 147 TPM_CAP_PROP_OWNER = 0x111, 148 TPM_CAP_PROP_TIS_TIMEOUT = 0x115, 149 TPM_CAP_PROP_TIS_DURATION = 0x120, 150 }; 151 152 153 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18 154 * bytes, but 128 is still a relatively large number of random bytes and 155 * anything much bigger causes users of struct tpm_cmd_t to start getting 156 * compiler warnings about stack frame size. */ 157 #define TPM_MAX_RNG_DATA 128 158 159 extern struct class *tpm_class; 160 extern struct class *tpmrm_class; 161 extern dev_t tpm_devt; 162 extern const struct file_operations tpm_fops; 163 extern const struct file_operations tpmrm_fops; 164 extern struct idr dev_nums_idr; 165 166 ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz); 167 int tpm_get_timeouts(struct tpm_chip *); 168 int tpm_auto_startup(struct tpm_chip *chip); 169 170 int tpm1_pm_suspend(struct tpm_chip *chip, u32 tpm_suspend_pcr); 171 int tpm1_auto_startup(struct tpm_chip *chip); 172 int tpm1_do_selftest(struct tpm_chip *chip); 173 int tpm1_get_timeouts(struct tpm_chip *chip); 174 unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal); 175 int tpm1_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash, 176 const char *log_msg); 177 int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf); 178 ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap, 179 const char *desc, size_t min_cap_length); 180 int tpm1_get_random(struct tpm_chip *chip, u8 *out, size_t max); 181 int tpm1_get_pcr_allocation(struct tpm_chip *chip); 182 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal); 183 int tpm_pm_suspend(struct device *dev); 184 int tpm_pm_resume(struct device *dev); 185 186 static inline void tpm_msleep(unsigned int delay_msec) 187 { 188 usleep_range((delay_msec * 1000) - TPM_TIMEOUT_RANGE_US, 189 delay_msec * 1000); 190 }; 191 192 int tpm_chip_start(struct tpm_chip *chip); 193 void tpm_chip_stop(struct tpm_chip *chip); 194 struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip); 195 196 struct tpm_chip *tpm_chip_alloc(struct device *dev, 197 const struct tpm_class_ops *ops); 198 struct tpm_chip *tpmm_chip_alloc(struct device *pdev, 199 const struct tpm_class_ops *ops); 200 int tpm_chip_register(struct tpm_chip *chip); 201 void tpm_chip_unregister(struct tpm_chip *chip); 202 203 void tpm_sysfs_add_device(struct tpm_chip *chip); 204 205 206 #ifdef CONFIG_ACPI 207 extern void tpm_add_ppi(struct tpm_chip *chip); 208 #else 209 static inline void tpm_add_ppi(struct tpm_chip *chip) 210 { 211 } 212 #endif 213 214 int tpm2_get_timeouts(struct tpm_chip *chip); 215 int tpm2_pcr_read(struct tpm_chip *chip, u32 pcr_idx, 216 struct tpm_digest *digest, u16 *digest_size_ptr); 217 int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, 218 struct tpm_digest *digests); 219 int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max); 220 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, 221 u32 *value, const char *desc); 222 223 ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip); 224 int tpm2_auto_startup(struct tpm_chip *chip); 225 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type); 226 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal); 227 int tpm2_probe(struct tpm_chip *chip); 228 int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip); 229 int tpm2_find_cc(struct tpm_chip *chip, u32 cc); 230 int tpm2_init_space(struct tpm_space *space, unsigned int buf_size); 231 void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space); 232 void tpm2_flush_space(struct tpm_chip *chip); 233 int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd, 234 size_t cmdsiz); 235 int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, void *buf, 236 size_t *bufsiz); 237 int tpm_devs_add(struct tpm_chip *chip); 238 void tpm_devs_remove(struct tpm_chip *chip); 239 240 void tpm_bios_log_setup(struct tpm_chip *chip); 241 void tpm_bios_log_teardown(struct tpm_chip *chip); 242 int tpm_dev_common_init(void); 243 void tpm_dev_common_exit(void); 244 #endif 245